Popular instant messaging application WhatsApp, social media giant Facebook and photo-sharing app Instagram on Thursday continues to suffer service outage for the second day in some parts of the world, including India.

Facebook’s messaging app Messenger is also down in some parts.

Though Facebook and Instagram users could open the apps, they experienced trouble in refreshing and uploading posts. WhatsApp, Facebook and Instagram services were disrupted for users across the globe for hours on Wednesday. Facebook Messenger also suffered service disruptions.

Following the outage, users expressed anguish and reported about the inconvenience faced by them on micro-blogging site Twitter. Hashtags such as #FacebookDown, #InstagramDown and #Whatsapp continued trending on Twitter on Thursday. Gmail Down Globally; Google Initiates Investigation as Users Report Problems.

"We're aware that some people are currently having trouble accessing the Facebook family of apps. We're working to resolve the issue as soon as possible," Facebook said in its initial response. The social media giant ruled out a cyber attack on its products Whatsapp, Instagram, and Messenger. "We're focused on working to resolve the issue as soon as possible, but can confirm that the issue is not related to a DDoS attack," Facebook said.

We’re aware that some people are currently having trouble accessing the Facebook family of apps. We’re working to resolve the issue as soon as possible.